成都平原农地利用方式转变对不同母质土壤剖面磁化率的影响  

Effects of Agricultural Land-use Change on Magnetic Susceptibility of Different Parent Soil Profile in Chengdu Plain

作　　者：张元媛 李呈吉 方红艳 邓茜 李艾雯 曾杰熙 李一丁 吴德勇 王昌全 李启权 ZHANG Yuan-yuan;LI Cheng-ji;FANG Hong-yan;DENG Qian;LI Ai-wen;ZENG Jie-xi;LI Yi-ding;WU De-yong;WANG Chang-quan;LI Qi-quan(College of Resources,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川农业大学资源学院,四川成都611130

出　　处：《土壤通报》2022年第1期89-96,共8页Chinese Journal of Soil Science

基　　金：四川省科技计划项目(2019YJ0433);四川省科技厅应用基础重大前沿项目(2018JY0002)资助。

摘　　要：【目的】分析区域土壤磁化率变化特征有助于掌握土壤环境变化规律和土壤演化特点,为区域土壤资源管理提供依据。【方法】本研究基于174个土壤剖面的675个采样数据,分析成都平原不同农地利用方式和母质条件下土壤剖面磁化率的差异,采用时空替代法探究农地利用方式转变对农田土壤剖面磁化率的影响。【结果】结果表明,研究区土壤磁化率随土层深度增加呈降低趋势;0~20 cm土层土壤磁化率(23.30×10^(−8)m^(3)kg^(−1))显著大于20~40 cm和40~60 cm土层(20.42×10^(−8)m^(3)kg^(−1)和19.36×10^(−8)m^(3)kg^(−1))。总体上,稻-蔬轮作地各土层土壤磁化率显著高于传统稻-麦/油轮作地和园林地,是后2种农地利用方式的1.57~2.15倍;园林地各土层土壤磁化率则与传统稻-麦/油轮作地相差不大。但稻-蔬轮作地和园林地土壤磁化率与传统稻-麦/油轮作地间的差异随着成土母质的变化而变化。Q3老冲积物和Q4灰棕冲积物发育的土壤上稻-蔬轮作地4个层次土壤磁化率均显著高于传统稻-麦/油轮作地(P<0.05),而Q4灰色冲积物发育的土壤上稻-蔬轮作地土壤磁化率仅在40~100 cm土层显著高于稻-麦/油轮作地(P<0.05)。园林地土壤剖面磁化率在Q3老冲积物发育的土壤上略高于传统稻-麦/油轮作地,在Q4灰色冲积物和Q4灰棕冲积物发育的土壤上则低于传统稻-麦/油轮作地;同时,在传统稻-麦/油轮作地上Q4灰色冲积物和Q4灰棕冲积物发育的土壤各土层磁化率均显著高于Q3老冲积物发育的土壤(P<0.05),但在园林地上3种母质发育的土壤各土层磁化率差异均不显著(P>0.05)。【结论】以上结果说明,农地利用方式转变对土壤磁化率的影响依赖于母质。传统稻-麦/油轮作地转变为稻-蔬轮作地和园林地改变了土壤剖面磁性特征;与传统稻-麦/油轮作相比,稻-蔬轮作显著增强了Q3老冲积物和Q4灰棕冲积物发育的土壤各土层�[Objective]The analysis of the variation characteristics of regional soil magnetic susceptibility can obtain the soil evolution and characteristics of soil environmental change,and provide a basis for regional soil resource management.[Method]This study analyzed the differences in the magnetic susceptibility of soil profiles in Chengdu Plain for different agricultural land-use patterns and parent material types based on 675 sample data from 174 soil profiles,and evaluated the effects of agricultural land-use changes on magnetic susceptibility of the farmland soil profile by using the space-time substitution method.[Result]The results showed that the magnetic susceptibility of soil decreased with the increase of soil depth.Soil magnetic susceptibility in 0~20 cm soil layer(23.30×10^(−8) m^(3) kg^(−1))was significantly higher than that in 20~40 cm and 40~60 cm soil layers(20.42×10^(−8) m^(3) kg^(−1) and 19.36×10^(−8) m^(3) kg^(−1)).In general,the magnetic susceptibility of each soil layer for rice-vegetable rotation was significantly higher than that for traditional rice-wheat/rapeseed rotation and afforested land,which were 1.57~2.15 times than that in the latter two agricultural land uses.While there was no significant difference in the magnetic susceptibility of each soil layer between the afforested land and the traditional rice-wheat/rapeseed land.However,the differences in the soil magnetic susceptibility between rice-vegetable rotation land and afforested land and traditional rice-wheat/rapeseed rotation land varied with soil parent material types.For soils formed from the Q3 old alluvium and Q4 grey-brown alluvium,the magnetic susceptibilities of the four layers in the rice-vegetable rotation land were significantly higher than that in the traditional rice-wheat/rapeseed rotations(P<0.05).But for soils formed from the Q4 grey alluvial,the soil magnetic susceptibilities in the rice-vegetable rotation land were significantly higher than that of the rice-wheat/rapeseed rotation land only in the

关 键 词：土壤磁化率 农地利用转变 土壤剖面 成土母质 成都平原 

分 类 号：X123[环境科学与工程—环境科学] S151[农业科学—土壤学]